Of that $30,000 they want, most all of it (like 90%) goes to advertising, not to teaching.
Buy this book from $2 used:
You can’t buy the power source he mentions except on eBay - doesn’t matter. Buy this instead:
Get a two wire extension cord from Dollar Tree, cut off the socket about 6" from the end and use the plug and cord to power the transformer. Use wire nuts or a connection strip from ACE etc.
It’s a good exercise to make the change and learn how to adapt the experiments to the different voltages.
Try your local library for “Mullin/Simmons Electrical Wiring Residential, 18th edition”. It’s very expensive. If you want to buy a copy, an older edition from eBay will do for learning.
Your library has many books on electricity and electrical work. Your son should try and read them all but only US ones, not British stuff.
You’ll be closer to $30 than to $30,000 and he’ll still get a good basic knowledge.
It’s very important to understand that the the only electricians who make it are the ones who read and study. No one learns it sitting in a classroom. No one.
If you want to go up one level, look into distance education. I didn’t do this:
https://www.scitraining.com/electrician
but it looks OK to me. See what references you can find for other schools. And you get a certificate.
As for tools, $100 is more than enough when you go to work. Careful shopping at Walmart and even dollar stores can get you set up to work for less money. I’ve also bought stuff on eBay which was fine and much cheaper, esp. for meters and other test gear.
Hope it helps. Give me a guy who taught himself over one who went to a dubious, overcharging ‘school’ every time.